Make-up free Jools Oliver displays her radiant complexion as she bundles up warm to take one-year-old son River Rocket for a power walk

She's said before that her secret to keeping an enviable body after having children is simply 'never getting the chance to sit down'.

And Jools Oliver was certainly living by her own rule book when she was spotted on a power walk with her one-year-old son River Rocket, who she shares with celebrity chef husband Jamie Oliver, in London on Wednesday.

The mother-of-five, 42, had a healthy flush to her cheeks as she marched make-up free down the pavement with River Rocket happily strapped into a papoose on her front.

Fit and healthy mum: Jools Oliver was spotted on a power walk with her and celebrity chef husband Jamie Oliver's youngest child, one-year-old River Rocket, in London on Wednesday

She tucked her brunette hair inside her jumper in a practical bid to keep it out of River's face as he gazed intently ahead at the wide world around him while chewing his lip thoughtfully.

Marching pair: The mother-of-five, 42, had a healthy flush to her cheeks as she walked down the pavement with River Rocket happily strapped into a papoose on her front

Baby on board! Jools was also spotted in her mum-on-the-go garb earlier this week as she carried her cute one-year-old through Primrose Hill

The brunette beauty and restaurateur Jamie, who married in 2000, have five children: Poppy Honey, 15, Daisy Boo, 14, Petal Blossom, eight, Buddy Bear, six, as well as River Rocket.

According to Jamie, the secret to his success was not his skill in the kitchen or his love of cooking - but his dyslexia.

He said last week that he believes the learning difficulty, which makes it difficult to read, write and spell, was the driving force behind the success of his multi-million pound business.

Speaking about how his first book, The Naked Chef, sold 2 million copies, he said: 'I was 24 years old. I was a special needs kid from Newport Grammar in Essex – it wasn't a grammar school, it was a free grammar, a comp – how do you explain that?'

Low-key: She went make-up free, showing off her naturally pretty features, and wore her brunette locks loosely about her face

Happy family: Jools and Jamie have five children, River Rocket being their most recent

He added: 'If I'm in a meeting I just see the problems differently and I obsess about things differently.

'Some bits of work need to be sweated over and cried over and crafted. Because I'm dyslexic, sometimes, when it requires a load of stuff to be done, I just do it. It's like I'm a massive ten-tonne boulder rolling down the hill.'

He said: 'I genuinely think that when someone says to you, 'Johnny's got dyslexia', you should get down on your knees, shake the child's hand and say, 'Well done, you lucky, lucky boy.'

'[Long-term success is] about finding something that you're good at. Because ultimately, what do we all need? We need to be fed, hugged, shown a bit of love, and to be safe. Everything else on top of that is gravy, really.'

Jamie Oliver, who released his 20th book last month, says dyslexia became the driving force behind his multi-million pound empire